Constant 12V from the battery (for fault code memory).
Leave out: EGR, immobilizer, AC idle-up, fuel heater, and vehicle speed sensor (unless you want cruise control). 1kz ecu pinout
The Engine Control Unit (ECU) maps electrical connection points for sensors and actuators. Depending on the model year (Early vs. Late), the pin configuration may vary. : +B, +BF : Battery power supply. IGSW : Ignition switch signal to activate the ECU. BATT : Continuous battery power for memory. Sensor Inputs : THW / THA : Water and Air temperature sensor signals. PIM : Intake manifold pressure (Boost) sensor. NE+ / NE- : Engine revolution (Crankshaft Position) sensor. TDC+ : Top Dead Center signal for timing. Control Outputs : Constant 12V from the battery (for fault code memory)
Always start with the pinout. Never throw parts at a diesel ECU until you verify voltage, ground, and signal at the pins. Depending on the model year (Early vs